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<span id="TCoreWebView2NavigationStartingEventArgs"></span><h1 class="cio">Class TCoreWebView2NavigationStartingEventArgs</h1>
<div class="sections">
<div class="one_section"><a class="section" href="#PasDoc-Description">Description</a></div><div class="one_section"><a class="section" href="#PasDoc-Hierarchy">Hierarchy</a></div><div class="one_section"><a class="section" href="#PasDoc-Fields">Fields</a></div><div class="one_section"><a class="section" href="#PasDoc-Methods">Methods</a></div><div class="one_section"><a class="section" href="#PasDoc-Properties">Properties</a></div></div>
<span id="PasDoc-Description"></span><h2 class="unit">Unit</h2>
<p class="unitlink">
<a href="uWVCoreWebView2Args.html">uWVCoreWebView2Args</a></p>
<h2 class="declaration">Declaration</h2>
<p class="declaration">
<code>type TCoreWebView2NavigationStartingEventArgs = class(TObject)</code></p>
<h2 class="description">Description</h2>
<p>
 Event args for the NavigationStarting event. </p>
<p>


<p>&lt;see href=&quot;<a href="https://learn.microsoft.com/en-us/microsoft-edge/webview2/reference/win32/icorewebview2navigationstartingeventargs">https://learn.microsoft.com/en-us/microsoft-edge/webview2/reference/win32/icorewebview2navigationstartingeventargs</a>&quot;&gt;See the ICoreWebView2NavigationStartingEventArgs article.)</p>
<span id="PasDoc-Hierarchy"></span><h2 class="hierarchy">Hierarchy</h2>
<ul class="hierarchy"><li class="ancestor">TObject</li>
<li class="thisitem">TCoreWebView2NavigationStartingEventArgs</li></ul><h2 class="overview">Overview</h2>
<span id="PasDoc-Fields"></span><h3 class="summary">Fields</h3>
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<td class="itemcode"><code><strong><a href="uWVCoreWebView2Args.TCoreWebView2NavigationStartingEventArgs.html#FBaseIntf">FBaseIntf</a></strong>: <a href="uWVTypeLibrary.ICoreWebView2NavigationStartingEventArgs.html">ICoreWebView2NavigationStartingEventArgs</a>;</code></td>
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<td class="itemcode"><code><strong><a href="uWVCoreWebView2Args.TCoreWebView2NavigationStartingEventArgs.html#FBaseIntf2">FBaseIntf2</a></strong>: <a href="uWVTypeLibrary.ICoreWebView2NavigationStartingEventArgs2.html">ICoreWebView2NavigationStartingEventArgs2</a>;</code></td>
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<td class="itemcode"><code><strong><a href="uWVCoreWebView2Args.TCoreWebView2NavigationStartingEventArgs.html#FBaseIntf3">FBaseIntf3</a></strong>: <a href="uWVTypeLibrary.ICoreWebView2NavigationStartingEventArgs3.html">ICoreWebView2NavigationStartingEventArgs3</a>;</code></td>
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<span id="PasDoc-Methods"></span><h3 class="summary">Methods</h3>
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<td class="itemcode"><code>function <strong><a href="uWVCoreWebView2Args.TCoreWebView2NavigationStartingEventArgs.html#GetInitialized">GetInitialized</a></strong>: boolean;</code></td>
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<td class="itemcode"><code>function <strong><a href="uWVCoreWebView2Args.TCoreWebView2NavigationStartingEventArgs.html#GetURI">GetURI</a></strong>: <a href="uWVTypes.html#wvstring">wvstring</a>;</code></td>
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<td class="itemcode"><code>function <strong><a href="uWVCoreWebView2Args.TCoreWebView2NavigationStartingEventArgs.html#GetIsUserInitiated">GetIsUserInitiated</a></strong>: boolean;</code></td>
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<td class="itemcode"><code>function <strong><a href="uWVCoreWebView2Args.TCoreWebView2NavigationStartingEventArgs.html#GetIsRedirected">GetIsRedirected</a></strong>: boolean;</code></td>
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<td class="itemcode"><code>function <strong><a href="uWVCoreWebView2Args.TCoreWebView2NavigationStartingEventArgs.html#GetCancel">GetCancel</a></strong>: boolean;</code></td>
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<td class="itemcode"><code>function <strong><a href="uWVCoreWebView2Args.TCoreWebView2NavigationStartingEventArgs.html#GetNavigationID">GetNavigationID</a></strong>: uint64;</code></td>
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<td class="itemcode"><code>function <strong><a href="uWVCoreWebView2Args.TCoreWebView2NavigationStartingEventArgs.html#GetRequestHeaders">GetRequestHeaders</a></strong>: <a href="uWVTypeLibrary.ICoreWebView2HttpRequestHeaders.html">ICoreWebView2HttpRequestHeaders</a>;</code></td>
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<td class="itemcode"><code>function <strong><a href="uWVCoreWebView2Args.TCoreWebView2NavigationStartingEventArgs.html#GetAdditionalAllowedFrameAncestors">GetAdditionalAllowedFrameAncestors</a></strong>: <a href="uWVTypes.html#wvstring">wvstring</a>;</code></td>
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<td class="itemcode"><code>function <strong><a href="uWVCoreWebView2Args.TCoreWebView2NavigationStartingEventArgs.html#GetNavigationKind">GetNavigationKind</a></strong>: <a href="uWVTypes.html#TWVNavigationKind">TWVNavigationKind</a>;</code></td>
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<td class="itemcode"><code>procedure <strong><a href="uWVCoreWebView2Args.TCoreWebView2NavigationStartingEventArgs.html#SetAdditionalAllowedFrameAncestors-wvstring-">SetAdditionalAllowedFrameAncestors</a></strong>(const aValue : <a href="uWVTypes.html#wvstring">wvstring</a>);</code></td>
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<td class="itemcode"><code>procedure <strong><a href="uWVCoreWebView2Args.TCoreWebView2NavigationStartingEventArgs.html#SetCancel-boolean-">SetCancel</a></strong>(aValue : boolean);</code></td>
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<td class="itemcode"><code>procedure <strong><a href="uWVCoreWebView2Args.TCoreWebView2NavigationStartingEventArgs.html#InitializeFields">InitializeFields</a></strong>;</code></td>
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<td class="itemcode"><code>constructor <strong><a href="uWVCoreWebView2Args.TCoreWebView2NavigationStartingEventArgs.html#Create-ICoreWebView2NavigationStartingEventArgs-">Create</a></strong>(const aArgs: <a href="uWVTypeLibrary.ICoreWebView2NavigationStartingEventArgs.html">ICoreWebView2NavigationStartingEventArgs</a>); reintroduce;</code></td>
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<td class="itemcode"><code>destructor <strong><a href="uWVCoreWebView2Args.TCoreWebView2NavigationStartingEventArgs.html#Destroy">Destroy</a></strong>; override;</code></td>
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<span id="PasDoc-Properties"></span><h3 class="summary">Properties</h3>
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<td class="itemcode"><code>property <strong><a href="uWVCoreWebView2Args.TCoreWebView2NavigationStartingEventArgs.html#Initialized">Initialized</a></strong>                       : boolean                                   read <a href="uWVCoreWebView2Args.TCoreWebView2NavigationStartingEventArgs.html#GetInitialized">GetInitialized</a>;</code></td>
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<td class="itemcode"><code>property <strong><a href="uWVCoreWebView2Args.TCoreWebView2NavigationStartingEventArgs.html#BaseIntf">BaseIntf</a></strong>                          : <a href="uWVTypeLibrary.ICoreWebView2NavigationStartingEventArgs.html">ICoreWebView2NavigationStartingEventArgs</a>  read <a href="uWVCoreWebView2Args.TCoreWebView2NavigationStartingEventArgs.html#FBaseIntf">FBaseIntf</a>;</code></td>
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<td class="itemcode"><code>property <strong><a href="uWVCoreWebView2Args.TCoreWebView2NavigationStartingEventArgs.html#URI">URI</a></strong>                               : <a href="uWVTypes.html#wvstring">wvstring</a>                                  read <a href="uWVCoreWebView2Args.TCoreWebView2NavigationStartingEventArgs.html#GetURI">GetURI</a>;</code></td>
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<td class="itemcode"><code>property <strong><a href="uWVCoreWebView2Args.TCoreWebView2NavigationStartingEventArgs.html#IsUserInitiated">IsUserInitiated</a></strong>                   : boolean                                   read <a href="uWVCoreWebView2Args.TCoreWebView2NavigationStartingEventArgs.html#GetIsUserInitiated">GetIsUserInitiated</a>;</code></td>
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<td class="itemcode"><code>property <strong><a href="uWVCoreWebView2Args.TCoreWebView2NavigationStartingEventArgs.html#IsRedirected">IsRedirected</a></strong>                      : boolean                                   read <a href="uWVCoreWebView2Args.TCoreWebView2NavigationStartingEventArgs.html#GetIsRedirected">GetIsRedirected</a>;</code></td>
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<td class="itemcode"><code>property <strong><a href="uWVCoreWebView2Args.TCoreWebView2NavigationStartingEventArgs.html#Cancel">Cancel</a></strong>                            : boolean                                   read <a href="uWVCoreWebView2Args.TCoreWebView2NavigationStartingEventArgs.html#GetCancel">GetCancel</a>                              write <a href="uWVCoreWebView2Args.TCoreWebView2NavigationStartingEventArgs.html#SetCancel-boolean-">SetCancel</a>;</code></td>
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<td class="itemcode"><code>property <strong><a href="uWVCoreWebView2Args.TCoreWebView2NavigationStartingEventArgs.html#NavigationID">NavigationID</a></strong>                      : uint64                                    read <a href="uWVCoreWebView2Args.TCoreWebView2NavigationStartingEventArgs.html#GetNavigationID">GetNavigationID</a>;</code></td>
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<td class="itemcode"><code>property <strong><a href="uWVCoreWebView2Args.TCoreWebView2NavigationStartingEventArgs.html#RequestHeaders">RequestHeaders</a></strong>                    : <a href="uWVTypeLibrary.ICoreWebView2HttpRequestHeaders.html">ICoreWebView2HttpRequestHeaders</a>           read <a href="uWVCoreWebView2Args.TCoreWebView2NavigationStartingEventArgs.html#GetRequestHeaders">GetRequestHeaders</a>;</code></td>
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<td class="itemcode"><code>property <strong><a href="uWVCoreWebView2Args.TCoreWebView2NavigationStartingEventArgs.html#AdditionalAllowedFrameAncestors">AdditionalAllowedFrameAncestors</a></strong>   : <a href="uWVTypes.html#wvstring">wvstring</a>                                  read <a href="uWVCoreWebView2Args.TCoreWebView2NavigationStartingEventArgs.html#GetAdditionalAllowedFrameAncestors">GetAdditionalAllowedFrameAncestors</a>     write <a href="uWVCoreWebView2Args.TCoreWebView2NavigationStartingEventArgs.html#SetAdditionalAllowedFrameAncestors-wvstring-">SetAdditionalAllowedFrameAncestors</a>;</code></td>
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<td class="itemcode"><code>property <strong><a href="uWVCoreWebView2Args.TCoreWebView2NavigationStartingEventArgs.html#NavigationKind">NavigationKind</a></strong>                    : <a href="uWVTypes.html#TWVNavigationKind">TWVNavigationKind</a>                         read <a href="uWVCoreWebView2Args.TCoreWebView2NavigationStartingEventArgs.html#GetNavigationKind">GetNavigationKind</a>;</code></td>
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<h2 class="description">Description</h2>
<h3 class="detail">Fields</h3>
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<td class="itemcode"><span id="FBaseIntf"></span><code><strong>FBaseIntf</strong>: <a href="uWVTypeLibrary.ICoreWebView2NavigationStartingEventArgs.html">ICoreWebView2NavigationStartingEventArgs</a>;</code></td>
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<td class="itemcode"><span id="FBaseIntf2"></span><code><strong>FBaseIntf2</strong>: <a href="uWVTypeLibrary.ICoreWebView2NavigationStartingEventArgs2.html">ICoreWebView2NavigationStartingEventArgs2</a>;</code></td>
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<td class="itemcode"><span id="FBaseIntf3"></span><code><strong>FBaseIntf3</strong>: <a href="uWVTypeLibrary.ICoreWebView2NavigationStartingEventArgs3.html">ICoreWebView2NavigationStartingEventArgs3</a>;</code></td>
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<h3 class="detail">Methods</h3>
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<td class="itemcode"><span id="GetInitialized"></span><code>function <strong>GetInitialized</strong>: boolean;</code></td>
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<td class="itemcode"><span id="GetURI"></span><code>function <strong>GetURI</strong>: <a href="uWVTypes.html#wvstring">wvstring</a>;</code></td>
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<td class="itemcode"><span id="GetIsUserInitiated"></span><code>function <strong>GetIsUserInitiated</strong>: boolean;</code></td>
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<td class="itemcode"><span id="GetIsRedirected"></span><code>function <strong>GetIsRedirected</strong>: boolean;</code></td>
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<td class="itemcode"><span id="GetCancel"></span><code>function <strong>GetCancel</strong>: boolean;</code></td>
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<td class="itemcode"><span id="GetNavigationID"></span><code>function <strong>GetNavigationID</strong>: uint64;</code></td>
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<td class="itemcode"><span id="GetRequestHeaders"></span><code>function <strong>GetRequestHeaders</strong>: <a href="uWVTypeLibrary.ICoreWebView2HttpRequestHeaders.html">ICoreWebView2HttpRequestHeaders</a>;</code></td>
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<td class="itemcode"><span id="GetAdditionalAllowedFrameAncestors"></span><code>function <strong>GetAdditionalAllowedFrameAncestors</strong>: <a href="uWVTypes.html#wvstring">wvstring</a>;</code></td>
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<td class="itemcode"><span id="GetNavigationKind"></span><code>function <strong>GetNavigationKind</strong>: <a href="uWVTypes.html#TWVNavigationKind">TWVNavigationKind</a>;</code></td>
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<td class="itemcode"><span id="SetAdditionalAllowedFrameAncestors-wvstring-"></span><code>procedure <strong>SetAdditionalAllowedFrameAncestors</strong>(const aValue : <a href="uWVTypes.html#wvstring">wvstring</a>);</code></td>
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<td class="itemcode"><span id="SetCancel-boolean-"></span><code>procedure <strong>SetCancel</strong>(aValue : boolean);</code></td>
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<td class="itemcode"><span id="InitializeFields"></span><code>procedure <strong>InitializeFields</strong>;</code></td>
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<td class="itemcode"><span id="Create-ICoreWebView2NavigationStartingEventArgs-"></span><code>constructor <strong>Create</strong>(const aArgs: <a href="uWVTypeLibrary.ICoreWebView2NavigationStartingEventArgs.html">ICoreWebView2NavigationStartingEventArgs</a>); reintroduce;</code></td>
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<td class="itemcode"><span id="Destroy"></span><code>destructor <strong>Destroy</strong>; override;</code></td>
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<h3 class="detail">Properties</h3>
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<td class="itemcode"><span id="Initialized"></span><code>property <strong>Initialized</strong>                       : boolean                                   read <a href="uWVCoreWebView2Args.TCoreWebView2NavigationStartingEventArgs.html#GetInitialized">GetInitialized</a>;</code></td>
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 Returns true when the interface implemented by this class is fully initialized. </p>
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<td class="itemcode"><span id="BaseIntf"></span><code>property <strong>BaseIntf</strong>                          : <a href="uWVTypeLibrary.ICoreWebView2NavigationStartingEventArgs.html">ICoreWebView2NavigationStartingEventArgs</a>  read <a href="uWVCoreWebView2Args.TCoreWebView2NavigationStartingEventArgs.html#FBaseIntf">FBaseIntf</a>;</code></td>
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 Returns the interface implemented by this class. </p>
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<td class="itemcode"><span id="URI"></span><code>property <strong>URI</strong>                               : <a href="uWVTypes.html#wvstring">wvstring</a>                                  read <a href="uWVCoreWebView2Args.TCoreWebView2NavigationStartingEventArgs.html#GetURI">GetURI</a>;</code></td>
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 The uri of the requested navigation. </p>
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<p>&lt;see href=&quot;<a href="https://learn.microsoft.com/en-us/microsoft-edge/webview2/reference/win32/icorewebview2navigationstartingeventargs#get_uri">https://learn.microsoft.com/en-us/microsoft-edge/webview2/reference/win32/icorewebview2navigationstartingeventargs#get_uri</a>&quot;&gt;See the ICoreWebView2NavigationStartingEventArgs article.)</p>
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<td class="itemcode"><span id="IsUserInitiated"></span><code>property <strong>IsUserInitiated</strong>                   : boolean                                   read <a href="uWVCoreWebView2Args.TCoreWebView2NavigationStartingEventArgs.html#GetIsUserInitiated">GetIsUserInitiated</a>;</code></td>
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 `TRUE` when the navigation was initiated through a user gesture as opposed to programmatic navigation by page script. Navigations initiated via WebView2 APIs are considered as user initiated. </p>
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<p>&lt;see href=&quot;<a href="https://learn.microsoft.com/en-us/microsoft-edge/webview2/reference/win32/icorewebview2navigationstartingeventargs#get_isuserinitiated">https://learn.microsoft.com/en-us/microsoft-edge/webview2/reference/win32/icorewebview2navigationstartingeventargs#get_isuserinitiated</a>&quot;&gt;See the ICoreWebView2NavigationStartingEventArgs article.)</p>
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<td class="itemcode"><span id="IsRedirected"></span><code>property <strong>IsRedirected</strong>                      : boolean                                   read <a href="uWVCoreWebView2Args.TCoreWebView2NavigationStartingEventArgs.html#GetIsRedirected">GetIsRedirected</a>;</code></td>
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 `TRUE` when the navigation is redirected. </p>
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<p>&lt;see href=&quot;<a href="https://learn.microsoft.com/en-us/microsoft-edge/webview2/reference/win32/icorewebview2navigationstartingeventargs#get_isredirected">https://learn.microsoft.com/en-us/microsoft-edge/webview2/reference/win32/icorewebview2navigationstartingeventargs#get_isredirected</a>&quot;&gt;See the ICoreWebView2NavigationStartingEventArgs article.)</p>
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<td class="itemcode"><span id="Cancel"></span><code>property <strong>Cancel</strong>                            : boolean                                   read <a href="uWVCoreWebView2Args.TCoreWebView2NavigationStartingEventArgs.html#GetCancel">GetCancel</a>                              write <a href="uWVCoreWebView2Args.TCoreWebView2NavigationStartingEventArgs.html#SetCancel-boolean-">SetCancel</a>;</code></td>
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 The host may set this flag to cancel the navigation. If set, the navigation is not longer present and the content of the current page is intact. For performance reasons, `GET` HTTP requests may happen, while the host is responding. You may set cookies and use part of a request for the navigation. Navigations to about schemes are cancellable, unless `msWebView2CancellableAboutNavigations` feature flag is disabled. Cancellation of frame navigation to `srcdoc` is not supported and wil be ignored. A cancelled navigation will fire a `NavigationCompleted` event with a `WebErrorStatus` of `COREWEBVIEW2_WEB_ERROR_STATUS_OPERATION_CANCELED`. </p>
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<p>&lt;see href=&quot;<a href="https://learn.microsoft.com/en-us/microsoft-edge/webview2/reference/win32/icorewebview2navigationstartingeventargs#get_cancel">https://learn.microsoft.com/en-us/microsoft-edge/webview2/reference/win32/icorewebview2navigationstartingeventargs#get_cancel</a>&quot;&gt;See the ICoreWebView2NavigationStartingEventArgs article.)</p>
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<td class="itemcode"><span id="NavigationID"></span><code>property <strong>NavigationID</strong>                      : uint64                                    read <a href="uWVCoreWebView2Args.TCoreWebView2NavigationStartingEventArgs.html#GetNavigationID">GetNavigationID</a>;</code></td>
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 The ID of the navigation. </p>
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<p>&lt;see href=&quot;<a href="https://learn.microsoft.com/en-us/microsoft-edge/webview2/reference/win32/icorewebview2navigationstartingeventargs#get_navigationid">https://learn.microsoft.com/en-us/microsoft-edge/webview2/reference/win32/icorewebview2navigationstartingeventargs#get_navigationid</a>&quot;&gt;See the ICoreWebView2NavigationStartingEventArgs article.)</p>
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<td class="itemcode"><span id="RequestHeaders"></span><code>property <strong>RequestHeaders</strong>                    : <a href="uWVTypeLibrary.ICoreWebView2HttpRequestHeaders.html">ICoreWebView2HttpRequestHeaders</a>           read <a href="uWVCoreWebView2Args.TCoreWebView2NavigationStartingEventArgs.html#GetRequestHeaders">GetRequestHeaders</a>;</code></td>
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<p>The HTTP request headers for the navigation.

<p>\&gt;NOTE: You are not able to modify the HTTP request headers in a `NavigationStarting` event.

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<p>&lt;see href=&quot;<a href="https://learn.microsoft.com/en-us/microsoft-edge/webview2/reference/win32/icorewebview2navigationstartingeventargs#get_requestheaders">https://learn.microsoft.com/en-us/microsoft-edge/webview2/reference/win32/icorewebview2navigationstartingeventargs#get_requestheaders</a>&quot;&gt;See the ICoreWebView2NavigationStartingEventArgs article.)</p>
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<td class="itemcode"><span id="AdditionalAllowedFrameAncestors"></span><code>property <strong>AdditionalAllowedFrameAncestors</strong>   : <a href="uWVTypes.html#wvstring">wvstring</a>                                  read <a href="uWVCoreWebView2Args.TCoreWebView2NavigationStartingEventArgs.html#GetAdditionalAllowedFrameAncestors">GetAdditionalAllowedFrameAncestors</a>     write <a href="uWVCoreWebView2Args.TCoreWebView2NavigationStartingEventArgs.html#SetAdditionalAllowedFrameAncestors-wvstring-">SetAdditionalAllowedFrameAncestors</a>;</code></td>
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 Get additional allowed frame ancestors set by the host app. </p>
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<p>&lt;see href=&quot;<a href="https://learn.microsoft.com/en-us/microsoft-edge/webview2/reference/win32/icorewebview2navigationstartingeventargs2#get_additionalallowedframeancestors">https://learn.microsoft.com/en-us/microsoft-edge/webview2/reference/win32/icorewebview2navigationstartingeventargs2#get_additionalallowedframeancestors</a>&quot;&gt;See the ICoreWebView2NavigationStartingEventArgs3 article.)</p>
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<td class="itemcode"><span id="NavigationKind"></span><code>property <strong>NavigationKind</strong>                    : <a href="uWVTypes.html#TWVNavigationKind">TWVNavigationKind</a>                         read <a href="uWVCoreWebView2Args.TCoreWebView2NavigationStartingEventArgs.html#GetNavigationKind">GetNavigationKind</a>;</code></td>
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 Get the navigation kind of this navigation. </p>
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<p>&lt;see href=&quot;<a href="https://learn.microsoft.com/en-us/microsoft-edge/webview2/reference/win32/icorewebview2navigationstartingeventargs3#get_navigationkind">https://learn.microsoft.com/en-us/microsoft-edge/webview2/reference/win32/icorewebview2navigationstartingeventargs3#get_navigationkind</a>&quot;&gt;See the ICoreWebView2NavigationStartingEventArgs3 article.)</p>
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